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Catalytic Converter Heat Shield Replacement - 1.4L LUH and LUJ > < Exhaust Heat Shield Replacement - Diesel and Petrol

Astra J

Warm Up Three-Way Catalytic Converter Replacement (1.4L LUH and LUJ)

Removal Procedure

1. Open the hood.
2. Disconnect battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .
3. Disconnect the heated oxygen sensor 1 wiring harness connector. Refer to Heated Oxygen Sensor Replacement - Sensor 1 .
4. Remove the exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement .

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5. Loosen the three way warm up catalytic converter V-clamp bolt (2) so that the three way warm up catalytic converter V-clamp (1) can be removed from catalytic converter to turbocharger flange.
6. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
7. Remove the engine front compartment insulator if equipped. Refer to Front Compartment Insulator Replacement

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Warning: Always wear protective goggles and gloves when removing exhaust parts as falling rust and sharp edges from worn exhaust components could result in serious personal injury.


Caution: Do not bend the exhaust flex pipe more than 10 degrees in any direction. Bending of more than 10 degrees or twisting in a range of ±0.5 degrees will damage the exhaust flex decoupler.

8. Remove the 3 catalytic converter flange nuts (2).
9. Remove the catalytic converter (3) from the three way warm up catalytic converter and hang aside.
10. Remove the catalytic converter gasket (1).

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11. Remove the 2 three way warm up catalytic converter bracket nuts (1) and (2).
12. Remove the three way warm up catalytic converter and the three way warm up catalytic converter to turbocharger seal ring.
13. Remove the heated oxygen sensor 1 from the three way warm up catalytic converter. Refer to Heated Oxygen Sensor Replacement - Sensor 1 .

Installation Procedure

1. Install the heated oxygen sensor 1 to the three way warm up catalytic converter. Refer to Heated Oxygen Sensor Replacement - Sensor 1 .

Note:  Never re-use the V-clamp.
2. Pre-install a NEW three way warm up catalytic converter V-clamp.
3. Install the three way warm up catalytic converter to the turbocharger and the three way warm up catalytic converter brackets. Install a NEW three way warm up catalytic converter to turbocharger seal ring.

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4. Install and hand-tighten the 2 three way warm up catalytic converter bracket nuts (1) and (2).
5. Lower the vehicle.
6. Install the three way warm up catalytic converter V-clamp to the catalytic converter to turbocharger flange.

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7. The three way warm up catalytic converter V-clamp (1) should be installed in the shown position.
8. Hand-tighten the three way warm up catalytic converter V-clamp.
9. Raise and support the vehicle.

Caution: Refer to Fastener Caution .
10. Tighten the 2 three way catalytic converter bracket nuts to 22 N·m (16 lb ft) .

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11. Install the catalytic converter (3) and a NEW catalytic converter gasket (1) to the three way warm up catalytic converter.
12. Install the 3 catalytic converter flange nuts (2) and tighten to 22 N·m (16 lb ft) .
13. Install the engine front compartment insulator if equipped. Refer to Front Compartment Insulator Replacement
14. Lower the vehicle.
15. Tighten the three way catalytic converter V-clamp bolt to 13 N·m (115 lb in) .
16. Install the exhaust manifold heat shield. Refer to Exhaust Manifold Heat Shield Replacement .
17. Connect the heated oxygen sensor 1 wiring harness plug. Refer to Heated Oxygen Sensor Replacement - Sensor 1 .
18. Connect battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .
19. Close the hood.

Catalytic Converter Heat Shield Replacement - 1.4L LUH and LUJ > < Exhaust Heat Shield Replacement - Diesel and Petrol